tree ac39a9c593acca23c9c9e5d05a7547404eaae232
parent 682156e46d861038047f382cdfe86b10abf52e07
author Yabin Cui <yabinc@google.com> 1595543414 -0700
committer Yabin Cui <yabinc@google.com> 1595977991 -0700

simpleperf: dump jit symfiles to a single file.

Currently, each jit symfile is dumped to a distinct temporary file. This creates
many temporary files, having two drawbacks:
1. It leaves many junk files if simpleperf is killed in the middle.
2. The names of the temporary files change in different recording files,
making them harder to compare.

This CL fixes it by making changes below:
1. Store jit symfiles in a single file. The location of a symfile is
passed via a special path format: <file_path>:<file_start>-<file_end>.
So the unwinder and ElfFile class can read it correctly.

2. Add Dso::GetReportPath() to give a unified name for jit symfiles. And
use it in different reporting methods.

Also split JITDebugReader::ReadProcess() into smaller functions.

Bug: 159155297
Test: run simpleperf_unit_test
Test: run simpleperf manually
Change-Id: I37cd1888b855b4b88bb83e453e39230b96fb304f